My wife and I are both 67 and have the usual arthritic aches and pains.
We live in rural Alberta and once a year (in the spring) we drag our trailer to the west side of Vancouver Island BC for a month beach bumming. Then go back home (Alberta foothills) for at least 2 months of boondocking in the foothills/mountains where we take our quads way back in the boonies. We have been doing this since I retired 5 years ago and don't plan to quit any time soon.
Tell your hubbie that he will just getting into the swing of things at age 68.
The worse thing to do as you get older is start thinking that in a couple of years from now I won't be able to do this or do that. If a person does that they may just end up convincing themselves.
Think Young and